using System;
using System.Collections;
using System.Linq;

class Program
{
	static void Main()
	{
		long[] xs = Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray();
		Console.WriteLine((((xs[0] * xs[1]) % xs[3]) * (xs[2] % xs[3])) % xs[3]);
	}
}

//A*B%D*C%D